Madden NFL 25 (iOS/Android): How to get more gold, platinum, ultimate and legend players

Madden NFL 25 (the iOS and Android version) takes the best of Madden NFL Social and the console versions of the Madden games and melds them together in a blend of football simulation and collectible card trading/management. Normal cards are the ones you start with, but gold ones are far higher ranking, and platinum, legend and ultimate ones are even more powerful, and can make or break the playoffs (or just a game against a tough friend).
(Android, iPad, iPhone, Madden NFL 25, Mobile)